typescript - 类变量在超级调用后的默认值？(Class variables default value after super call?)

Question

Say I have some basic class that gets an object of properties and sets them in the class:

(假设我有一些基本类，可以获取属性的对象并将其设置在类中：)

export interface BaseNodeProps {
  id? : string;
}


export class BaseNode {

  id : string;

  constructor(props: BaseNodeProps) {

    for (let prop in props)
      this[prop] = props[prop];

  }

}

And I extend this class to have more properties

(我扩展了该类，使其具有更多属性)

export interface ExtendedProps extends BaseNodeProps {
  name? : string;
  list? : string[];
}


export class ExtendedNode extends BaseNode {

  name : string = 'Default name';
  list : string[] = [];

  constructor(props: BaseNodeProps) {

    super(props);

  }

}

Now, say I want to call for new ExtendedNode with some properties:

(现在，假设我要调用具有某些属性的新ExtendedNode：)

someProps = {
  name : 'My name',
  list : ['thing to do', 'another thing to do']
}

When I call for new ExtendedNode(someProps) , the object always get the default values (ie 'Default name' and [] ), although I sent different values to the construcor in someProps , that the super() method should set.

(当我调用new ExtendedNode(someProps) ，对象总是获得默认值（即'Default name'和[] ），尽管我向someProps的construcor发送了不同的值，但应该设置super()方法。)

Does the super() command is being called before the variables declaration?

(在变量声明之前是否调用了super（）命令？)

What is the reason for this?

(这是什么原因呢？)

  ask by Moshe Estroti translate from so

Answer 1

等待大神答复